var app1 = angular.module('app1', []);

app1.controller('ctrl1', function($scope){
	$scope.first = 1;
	$scope.second = 1;
	$scope.updateValue = function(){
		$scope.calculation = $scope.first  + '+' +  $scope.second + 
		"=" +  ($scope.first + $scope.second);
	};

});